David Reynoso Books

Math Challenge I A Pre Algebra and Word Problems

By Kevin Wang Ph.D., John Lensmire, David Reynoso, Kelly Ren, Areteem Institute

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Fun Math Problem Solving for Elementary School Volume 2

By Kevin Wang, John Lensmire, David Reynoso

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ZIML Math Competition Book Division M 2018-2019

By Kevin Wang, John Lensmire, David Reynoso

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Each month during the school year, Areteem Institute hosts the online Zoom International Math League (ZIML) competitions. Students can compete in one of five divisions based on their age and mathem...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.